Cut pound cake into 6 even slices
Place a slice of pound cake, 1 drop of food coloring, and 1 Tablespoon of frosting into your mixer or food processor. Pulse for 30 seconds. Repeat this step with 6 different colors. Use each color of batter to make approximately 6 cake balls (36 colored cake balls in total).
Prepare your white cake according to package directions or according to your recipe. Pour a small amount into a well-greased Bundt pan. Drop a few cake balls into the batter. Continue layering the cake balls and batter.
Bake according to package directions or recipe.
Let cake cool completely before removing it from the pan.
To remove the cake, place a large plate over the bundt pan and while holding the plate in place, invert the pan, the cake should drop unto the plate.